<%#
 Copyright 2011-2018 Jo-Philipp Wich <jo@mein.io>
 Licensed to the public under the Apache License 2.0.
-%>

<%-
	local ntm = require "luci.model.network".init()

	local dev
	local devices = { }
	for _, dev in luci.util.vspairs(luci.sys.net.devices()) do
		if dev:match("^wlan%d") or dev:match("^ath%d") or dev:match("^wl%d") then
			devices[#devices+1] = dev
		end
	end

	local curdev = luci.http.formvalue("dev") or devices[1]
-%>

<%+header%>

<script type="text/javascript">//<![CDATA[
	var bwxhr = new XHR();

	var G, G2;
	var TIME  = 0;
	var RATE  = 1;
	var RSSI  = 2;
	var NOISE = 3;

	var width  = 760;
	var height = 300;
	var step   = 5;

	var data_wanted = Math.floor(width / step);
	var data_fill   = 1;
	var data_stamp  = 0;

	var data_rssi = [ ];
	var data_noise = [ ];
	var data_rate = [ ];

	var line_rssi;
	var line_noise;
	var line_rate;

	var label_25, label_25_2;
	var label_50, label_50_2;
	var label_75, label_75_2;

	var label_rssi_cur;
	var label_rssi_avg;
	var label_rssi_peak;

	var label_noise_cur;
	var label_noise_avg;
	var label_noise_peak;

	var label_rate_cur;
	var label_rate_avg;
	var label_rate_peak;

	var label_scale;
	var label_scale_2;


	/* wait for SVG */
	window.setTimeout(
		function() {
			var svg = document.getElementById('iwsvg');
			var svg2 = document.getElementById('iwsvg2');

			try {
				G = svg.getSVGDocument
					? svg.getSVGDocument() : svg.contentDocument;
				G2 = svg2.getSVGDocument
					? svg2.getSVGDocument() : svg2.contentDocument;
			}
			catch(e) {
				G = document.embeds['iwsvg'].getSVGDocument();
				G2 = document.embeds['iwsvg2'].getSVGDocument();
			}

			if (!G || !G2)
			{
				window.setTimeout(arguments.callee, 1000);
			}
			else
			{
				/* find sizes */
				width       = svg.offsetWidth  - 2;
				height      = svg.offsetHeight - 2;
				data_wanted = Math.ceil(width / step);

				/* prefill datasets */
				for (var i = 0; i < data_wanted; i++)
				{
					data_rssi[i] = 0;
					data_noise[i] = 0;
					data_rate[i] = 0;
				}

				/* find svg elements */
				line_rssi = G.getElementById('rssi');
				line_noise = G.getElementById('noise');
				line_rate = G2.getElementById('rate');

				label_25 = G.getElementById('label_25');
				label_50 = G.getElementById('label_50');
				label_75 = G.getElementById('label_75');
				label_25_2 = G2.getElementById('label_25');
				label_50_2 = G2.getElementById('label_50');
				label_75_2 = G2.getElementById('label_75');

				label_rssi_cur  = document.getElementById('rssi_bw_cur');
				label_rssi_avg  = document.getElementById('rssi_bw_avg');
				label_rssi_peak = document.getElementById('rssi_bw_peak');

				label_noise_cur  = document.getElementById('noise_bw_cur');
				label_noise_avg  = document.getElementById('noise_bw_avg');
				label_noise_peak = document.getElementById('noise_bw_peak');

				label_rate_cur  = document.getElementById('rate_bw_cur');
				label_rate_avg  = document.getElementById('rate_bw_avg');
				label_rate_peak = document.getElementById('rate_bw_peak');

				label_scale   = document.getElementById('scale');
				label_scale_2 = document.getElementById('scale2');


				/* plot horizontal time interval lines */
				for (var i = width % (step * 60); i < width; i += step * 60)
				{
					var line = G.createElementNS('http://www.w3.org/2000/svg', 'line');
						line.setAttribute('x1', i);
						line.setAttribute('y1', 0);
						line.setAttribute('x2', i);
						line.setAttribute('y2', '100%');
						line.setAttribute('style', 'stroke:black;stroke-width:0.1');

					var text = G.createElementNS('http://www.w3.org/2000/svg', 'text');
						text.setAttribute('x', i + 5);
						text.setAttribute('y', 15);
						text.setAttribute('style', 'fill:#eee; font-size:9pt; font-family:sans-serif; text-shadow:1px 1px 1px #000');
						text.appendChild(G.createTextNode(Math.round((width - i) / step / 60) + 'm'));

					label_25.parentNode.appendChild(line);
					label_25.parentNode.appendChild(text);


					var line2 = G2.createElementNS('http://www.w3.org/2000/svg', 'line');
						line2.setAttribute('x1', i);
						line2.setAttribute('y1', 0);
						line2.setAttribute('x2', i);
						line2.setAttribute('y2', '100%');
						line2.setAttribute('style', 'stroke:black;stroke-width:0.1');

					var text2 = G2.createElementNS('http://www.w3.org/2000/svg', 'text');
						text2.setAttribute('x', i + 5);
						text2.setAttribute('y', 15);
						text2.setAttribute('style', 'fill:#eee; font-size:9pt; font-family:sans-serif; text-shadow:1px 1px 1px #000');
						text2.appendChild(G.createTextNode(Math.round((width - i) / step / 60) + 'm'));

					label_25_2.parentNode.appendChild(line2);
					label_25_2.parentNode.appendChild(text2);
				}

				label_scale.innerHTML = String.format('<%:(%d minute window, %d second interval)%>', data_wanted / 60, 3);
				label_scale_2.innerHTML = String.format('<%:(%d minute window, %d second interval)%>', data_wanted / 60, 3);

				/* render datasets, start update interval */
				XHR.poll(3, '<%=build_url("admin/status/realtime/wireless_status", curdev)%>', null,
					function(x, data)
					{
						var noise_floor = 255;
						var rate_floor = 60000;

						for (var i = 0; i < data.length; i++) {
							noise_floor = Math.min(noise_floor, data[i][NOISE]);
							rate_floor = Math.min(rate_floor, data[i][RATE]);
						}

						noise_floor -= 5;

						var data_max   = 0;
						var data_scale = 0;
						var data_max_2   = 0;
						var data_scale_2 = 0;

						var data_rssi_avg = 0;
						var data_noise_avg = 0;
						var data_rate_avg = 0;

						var data_rssi_peak = 0;
						var data_noise_peak = 0;
						var data_rate_peak = 0;

						for (var i = data_stamp ? 0 : 1; i < data.length; i++)
						{
							/* skip overlapping entries */
							if (data[i][TIME] <= data_stamp)
								continue;

							data_fill++;

							data_rssi.push(data[i][RSSI] - noise_floor);
							data_noise.push(data[i][NOISE] - noise_floor);
							data_rate.push(Math.floor(data[i][RATE] / 1000));
						}

						/* cut off outdated entries */
						data_fill = Math.min(data_fill, data_wanted);
						data_rssi = data_rssi.slice(data_rssi.length - data_wanted, data_rssi.length);
						data_noise = data_noise.slice(data_noise.length - data_wanted, data_noise.length);
						data_rate = data_rate.slice(data_rate.length - data_wanted, data_rate.length);

						/* find peak */
						for (var i = 0; i < data_rssi.length; i++)
						{
							data_max = Math.max(data_max, data_rssi[i]);
							data_max_2 = Math.max(data_max_2, data_rate[i]);

							data_rssi_peak = Math.max(data_rssi_peak, data_rssi[i]);
							data_noise_peak = Math.max(data_noise_peak, data_noise[i]);
							data_rate_peak = Math.max(data_rate_peak, data_rate[i]);

							data_rssi_avg += data_rssi[i];
							data_noise_avg += data_noise[i];
							data_rate_avg += data_rate[i];
						}

						data_rssi_avg = data_rssi_avg / data_fill;
						data_noise_avg = data_noise_avg / data_fill;
						data_rate_avg = data_rate_avg / data_fill;

						/* remember current timestamp, calculate horizontal scale */
						data_stamp = data[data.length-1][TIME];
						data_scale = (height / (data_max * 1.1)).toFixed(1);
						data_scale_2 = (height / (data_max_2 * 1.1)).toFixed(1);

						/* plot data */
						var pt_rssi = '0,' + height;
						var pt_noise = '0,' + height;
						var pt_rate = '0,' + height;

						var y_rssi = 0;
						var y_noise = 0;
						var y_rate = 0;

						for (var i = 0; i < data_rssi.length; i++)
						{
							var x = i * step;

							y_rssi = height - Math.floor(data_rssi[i] * data_scale);
							y_noise = height - Math.floor(data_noise[i] * data_scale);
							y_rate = height - Math.floor(data_rate[i] * data_scale_2);

							y_rssi -= Math.floor(y_rssi % (1/data_scale));
							y_noise -= Math.floor(y_noise % (1/data_scale));

							pt_rssi += ' ' + x + ',' + y_rssi;
							pt_noise += ' ' + x + ',' + y_noise;
							pt_rate += ' ' + x + ',' + y_rate;
						}

						pt_rssi += ' ' + width + ',' + y_rssi + ' ' + width + ',' + height;
						pt_noise += ' ' + width + ',' + y_noise + ' ' + width + ',' + height;
						pt_rate += ' ' + width + ',' + y_rate + ' ' + width + ',' + height;

						line_rssi.setAttribute('points', pt_rssi);
						line_noise.setAttribute('points', pt_noise);
						line_rate.setAttribute('points', pt_rate);

						function wireless_label(dbm, noise)
						{
							if (noise)
								return String.format("%d <%:dBm%> (SNR %d <%:dB%>)", noise_floor + dbm - 255, dbm - noise);
							else
								return String.format("%d <%:dBm%>", noise_floor + dbm - 255);
						}

						function rate_label(mbit)
						{
							return String.format("%d <%:Mbit/s%>", mbit);
						}

						label_25.firstChild.data = wireless_label(1.1 * 0.25 * data_max);
						label_50.firstChild.data = wireless_label(1.1 * 0.50 * data_max);
						label_75.firstChild.data = wireless_label(1.1 * 0.75 * data_max);

						label_25_2.firstChild.data = rate_label(1.1 * 0.25 * data_max_2);
						label_50_2.firstChild.data = rate_label(1.1 * 0.50 * data_max_2);
						label_75_2.firstChild.data = rate_label(1.1 * 0.75 * data_max_2);

						label_rssi_cur.innerHTML = wireless_label(data_rssi[data_rssi.length-1], data_noise[data_noise.length-1]).nobr();
						label_noise_cur.innerHTML = wireless_label(data_noise[data_noise.length-1]).nobr();

						label_rssi_avg.innerHTML = wireless_label(data_rssi_avg, data_noise_avg).nobr();
						label_noise_avg.innerHTML = wireless_label(data_noise_avg).nobr();

						label_rssi_peak.innerHTML = wireless_label(data_rssi_peak, data_noise_peak).nobr();
						label_noise_peak.innerHTML = wireless_label(data_noise_peak).nobr();

						label_rate_cur.innerHTML = rate_label(data_rate[data_rate.length-1]);
						label_rate_avg.innerHTML = rate_label(data_rate_avg);
						label_rate_peak.innerHTML = rate_label(data_rate_peak);
					}
				);

				XHR.run();
			}
		}, 1000
	);
//]]></script>

<h2 name="content"><%:Realtime Wireless%></h2>

<ul class="cbi-tabmenu">
	<% for _, dev in ipairs(devices) do %>
		<li class="cbi-tab<%= dev == curdev and "" or "-disabled" %>"><a href="?dev=<%=pcdata(dev)%>"><%=pcdata(dev)%></a></li>
	<% end %>
</ul>

<embed id="iwsvg" style="width:100%; height:300px; border:1px solid #000000; background-color:#FFFFFF" src="<%=resource%>/wireless.svg" />
<div style="text-align:right"><small id="scale">-</small></div>
<br />

<div class="table" style="width:100%; table-layout:fixed" cellspacing="5">
	<div class="tr">
		<div class="td" style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid blue"><%:Signal:%></strong></div>
		<div class="td" id="rssi_bw_cur">0 <%:dBm%></div>

		<div class="td" style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></div>
		<div class="td" id="rssi_bw_avg">0 <%:dBm%></div>

		<div class="td" style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></div>
		<div class="td" id="rssi_bw_peak">0 <%:dBm%></div>
	</div>
	<div class="tr">
		<div class="td" style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid red"><%:Noise:%></strong></div>
		<div class="td" id="noise_bw_cur">0 <%:dBm%></div>

		<div class="td" style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></div>
		<div class="td" id="noise_bw_avg">0 <%:dBm%></div>

		<div class="td" style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></div>
		<div class="td" id="noise_bw_peak">0 <%:dBm%></div>
	</div>
</div>

<br />

<embed id="iwsvg2" style="width:100%; height:300px; border:1px solid #000000; background-color:#FFFFFF" src="<%=resource%>/wifirate.svg" />
<div style="text-align:right"><small id="scale2">-</small></div>
<br />

<div class="table" style="width:100%; table-layout:fixed" cellspacing="5">
	<div class="tr">
		<div class="td" style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid green"><%:Phy Rate:%></strong></div>
		<div class="td" id="rate_bw_cur">0 MBit/s</div>

		<div class="td" style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></div>
		<div class="td" id="rate_bw_avg">0 MBit/s</div>

		<div class="td" style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></div>
		<div class="td" id="rate_bw_peak">0 MBit/s</div>
	</div>
</div>

<%+footer%>
